Allen d



(No Model.)

A. D. LINN. CLAMP FOR SGHOOL DESKS.

No,598,674. Patented Peb. 8.1898.

removal of the fastening-bolt.

* UNTTED STATES PATENT OFFICE.-

ALLEN D. LINN, GRAND RAPIDS, MICHIGAN, ASSIGNOR TO THE GRAND RAPIDS SCHOOL FURNITURE COMPANY, OF SAME PLACE.

CLAMP FOR SCHOOL-DESKS.

SPECIFICATION forming part of Letters Patent No. 598,674, dated February 8, 1898. Application filed. July 29, 1897. Serial No. 646,388. (No model.)

To all whom it may concern:

Be it known that I, ALLEN D. LINN,'a citizen of the United States, residing at Grand Rapids, in the county of Kent and State of Michigan, have invented certain new and useful Improvements in Clamps for School- Desks, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to adjustable desks, and aims to provide a connection between the adjustable parts thereof which while securely holding the parts together will under certain conditions permit ready adjustment without binding and Without requiring the complete detachment of the holding means. While it is my purpose to use this fastening device in connection with an adjustable top, I do not limit myself to this connection, as the fastening may be used in any situation where it may be found convenient or desirable.

In the accompanying drawings I have simply shown a portion of the standards, as I f the bracket and standard. Fig. 4: is a face View of the block.

The standard which supportsthe desk is shown at A, and this is channeled on its inner face, so as to receive the corresponding portion of the bracket-support on or forming part of the desk. The walls of the channeled portion are inclined, and the walls of the desk bracket or standard are likewise inclined, so as to fit snugly the channels in the standards A. The relative position of the parts is shown in Fig. 1 ready for assembling, which would be done by moving the parts together laterally. The desk-standards shown at B are provided with a vertically-extending slot, perinitting the vertical adjustment of the standard on the standards A without requiring the The deskstandards are made hollow, their inner faces conforming tothe outline of their outer faces.

The standards A are each provided with a boltholes projections or bosses are providedfor a purpose hereinafter more fully described. The standards B fit snugly within the channeled inner face of the standards A, passing.

over the bosses a above and below the boltholes I). The bosses at project through the slot in the standard B and are adapted to receivebetween them a block of the shape shown in Fig. 1 at C. This block is provided with a central opening adapted to register with the bolt-hole in the standards A and having recesses at top and bottom fitted to receive the projecting ends of the bosses a, while the base of the block has a firm bearing on the inner face of the desk-standard B. The block contains a circular cavity a little larger than the opening in its bottom, so as to leave a flange d, and this flange forms a bearing for the end of a spring 6. A bolt f is adapted to pass through the block, the slot in the standard 13, and the opening in the standard A, and to be engaged by a nut and washer upon the outer face of the standard A. This bolt also passes through the spring, and the head of the bolt, which is square, is adapted to enter a squared recess in the head of the b1ock,which prevents it from turning when force is applied to turn up the nut on the other end. The spring within the cavity bears against the under face of the bolt-head and puts sufficient tension upon the part so asto permit of the adjustment of the desk without entirely removing the bolt, and at the same time the friction is sufficient to hold the parts in place during the temporary adjustment, and when the proper height is secured and the nut is tightened the inner face of the head of the bolt finds a rigid bearing in the recess inthe end ofthe block and there is no strain upon the spring. will be seen that the projection a engages the block at top and bottom, and thus carries the load and relieves the bolt of all strain, as in the bracket from moving up or down as the desk is adjusted, which would cause a binding of the bolt and necessitate further 100sening thereof. This is all avoided by the construction described.

What I claim is 1. In combination,the standard,the bracket having a vertical slot therein, the projections a, a, on the standard extending through the said slot, the block between the projections having the portions for engaging the bracket and the bolt for drawing the parts together, said bolt passing through the slot in the bracket and through an opening in the standard, substantially as described.

2. In combination, the standard having a channeled face, the projections a, a, extending from said channel, the bracket also of channel form fitted to the channel in the standard and slotted to receive the projections a, a, and the block fitted between the projections and bearing on the bracket with the bolt for drawing the parts together, substantially as described.

3. In combination, the channeled standard, the channeled and slotted bracket fitted thereto, the projections a, (1, extending through the slot, the block having recesses to receive the projections and a recess to receive the head of the bolt, the bolt having its head engaging the recess in the block and the spring within the block, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

ALLEN D. LINN.

Witnesses:

L. T. GIBsoN, L. M. OLMsT'ED. 

